[MS-OXPSVAL]: E-Mail Postmark Validation Protocol Specification

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Curious if anyone has read over this, and what their thoughts are. This is
Microsoft's implementation of a proof-of-work system, similar to Hashcash
(I hesitate to call it a "derivative").

http://msdn.microsoft.com/en-us/library/cc433493%28v=3Dexchg.80%29.aspx

=46rom what I can tell, the protocol is covered by a royalty-based patent,
which will prevent any Free Software implementations. What I find
interesting, is the recipients, sender and subject are encoded into a
base-64 string. What's the purpose of this? base-64 encoding doesn't add
any significant time to the processing, and it's trivial to reverse getting
the original data.

Anyway, just curious.

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=2E o .   o . o   . . o   o . .   . o .
=2E . o   . o o   o . o   . o o   . . o
o o o   . o .   . o o   o o .   o o o

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